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# Reflections in a Plane Mirror

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• 1. Reflections in a Plane Mirror
• 2. Reflection in a Plane Mirror
• 3. Activity 4.11
How Light Reflects
• 4. A
B
• 5. Law of Reflection:
When light reflects off a surface, the angle of incidence is always equal to the angle of reflection
i = r
• 6. Looking in a mirror
• 7. Looking in a mirror
• 8. Looking in a mirror
• 9. Object distance vs. Image Distance
• 10. Ray Diagrams
for reflections in a plane mirror
• 11. Step 1
Identify the top and the bottom of the object (label these “A” and “B”)
• 12. Step 2
Draw a line from point A that is perpendicular to the mirror
• 13. Step 3
Draw an incident ray (starting at point A)
Draw a “normal” where the incident ray hits the mirror
Use a protractor to draw a reflecting ray
(Remember that i = r )
• 14. Step 4
Extend line A to point Ai (equidistant from point A on the other side of the mirror)
Connect point Ai to your reflection ray
• 15. Step 5
Repeat steps 2-4 for Point B
• 16. Try it!
• 17. Activity D8
Does a plane mirror reverse Left and Right?